Question 37957
Well think about it.
If 1 cube weighs 2.5 ounces, how many will 2 weigh? 
5 ounces of course!
How did I get that? Since there are 2 cubes I just simply multiplied the mass by 2.
So, apply it to the current problem. 
How heavy will 200 cubes weigh?
{{{2.5*200}}}
Answer: {{{highlight(500 pounds)}}}
Hope this helps!